Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9445b556bad5289…

MALICIOUS

PDF

75.1 KB Created: 2021-02-27 11:40:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 03f4635ff2dcc5330b1b91d0d83534ed SHA-1: 4238daa6322b8c961d2f573260fa7d6c70b423f1 SHA-256: c9445b556bad5289c43ef9bbf2705c65bce078ccfaccf0eb6b14b257d75ca88c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with the primary one being `https://pelibifir.ru/award?keyword=how+to+remove+first+alert+smoke+detector`, suggesting a phishing or malware distribution lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that the document is designed to host a large number of links on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pelibifir.ru/award?keyword=how+to+remove+first+alert+smoke+detector PDF link annotation
    • http://nuwiratuzitezep.22web.org/zadokekivolupijiwigil.pdfIn PDF document text
    • http://jugixemetofun.22web.org/59088232657.pdfIn PDF document text
    • https://suxekupawuva.weebly.com/uploads/1/3/2/7/132710704/sajujolib.pdfIn PDF document text
    • http://ch-data-2a8fv9s.pw/c_string_format_codes6blew.pdfIn PDF document text
    • https://pobizaxorede.weebly.com/uploads/1/3/2/6/132696020/6255687.pdfIn PDF document text
    • http://tuguxanofa.iblogger.org/thank_you_card_template_word_half_fold.pdfIn PDF document text
    • http://tawojerikopopud.iblogger.org/child_emergency_contact_form.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zefitog.epizy.com/assembling_and_disassembling_of_computer_notes.pdfIn PDF document text
    • http://jajapelemazibog.rf.gd/biofinity_multifocal_fitting_guide.pdfIn PDF document text
    • http://pewusufep.epizy.com/29046086469.pdfIn PDF document text
    • http://famosubapaji.epizy.com/siguposimudeguvupobezikez.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/bowuzi.pdfIn PDF document text
    • http://pigutun.myartsonline.com/why_do_i_have_blood_in_my_eyeball.pdfIn PDF document text
    • http://xarozitapakegur.epizy.com/textbook_of_biochemistry_by_satyanarayana_free.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE945 5344 bytes
SHA-256: d0edba910da9cece6d4d885c8e0f85b7f1545d753c59b063c89f79b5e5876a6e
font_01_sfnt_off0000fb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6C 10428 bytes
SHA-256: 4e4fbf25e3c06b8525f91b09b5e627707cd1851a2678a7a7e7d88e2229bf4967

Open this report in the interactive analyzer, or submit your own file for analysis.